Striving, Risking, or Revealing (On)

专注于, 集中精力于

The students were focusing on their final exams this past month.

学生们上个月专注于他们的期末考试。

告发, 举报

He decided to inform on his neighbor, who had been involved in a series of burglaries.

他决定告发他的邻居，后者参与了一系列的盗窃案。

坚持, 要求

The customer insisted on a replacement for the damaged product.

顾客坚持要求更换损坏的产品。

透露, 泄露

He let on that he knew about the promotion before anyone else.

他透露他在其他人之前就知道晋升的事。

告发, 打小报告

He told on his classmates when he saw them cheating on the test.

当他看到同学们在考试中作弊时，他告发了他们。

旁观, 作为观众观看

Passers-by simply looked on as the two men argued heatedly on the sidewalk.

路人只是旁观，那两个男人在人行道上激烈争吵。

监视, 暗中观察

The detective decided to spy on the suspect to gather evidence for the case.

侦探决定监视嫌疑人以收集案件证据。

致力于, 专注于

She's working on a solution to address the recurring issues in the system.

她正在致力于一个解决方案，以解决系统中的反复出现的问题。